Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
tai khoa » da khoa, noi khoa
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va cao » va cac, va co, va dao
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang tai khoa. hieu ((((ve cam) OR (ve cac))) or (va cao)) dua ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang tai khoa. hieu ((((ve cam) OR (ve cac))) OR (va cao)) dua ban hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang tai khoa. hieu ((((ve cam) OR (ve cac))) or (va cao)) dua ban hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang tai khoa. hieu ((((ve cam) OR (ve cac))) or (va cao)) dua ban hanh vai cua tre*.